#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;
const int N = 25;
typedef long long ll;
ll f[N][N][N];
ll a, b, c;
ll dfs(ll a, ll b, ll c)
{
    if (a <= 0 || b <= 0 || c <= 0)
    {
        return 1;
    }
    if (a > 20 || b > 20 || c > 20)
    {
        return dfs(20, 20, 20);
    }
    if (f[a][b][c])
    {
        return f[a][b][c];
    }
    if (a < b && b < c)
    {
        return f[a][b][c] = dfs(a, b, c - 1) + dfs(a, b - 1, c - 1) - dfs(a, b - 1, c);
    }
    else
    {
        return f[a][b][c] = dfs(a - 1, b, c) + dfs(a - 1, b - 1, c) + dfs(a - 1, b, c - 1) - dfs(a - 1, b - 1, c - 1);
    }
}
int main()
{
    while (cin >> a >> b >> c)
    {
        if (a == -1 && b == -1 && c == -1)
            break;
        printf("w(%lld, %lld, %lld) = %lld\n", a, b, c, dfs(a, b, c));
    }
    return 0;
}